[OH:1][CH2:2][CH2:3][N:4]1[C:8](=[O:9])[C:7]([CH3:10])=[C:6]([CH3:11])[C:5]1=[O:12].[Cl:13][CH2:14][C:15](O)=[O:16].S(=O)(=O)(O)O.O>C1(C)C=CC=CC=1>[Cl:13][CH2:14][C:15]([O:1][CH2:2][CH2:3][N:4]1[C:8](=[O:9])[C:7]([CH3:10])=[C:6]([CH3:11])[C:5]1=[O:12])=[O:16]With stirring, 169.2 g (1 mole) of N-(2-hydroxyethyl)dimethylmaleimide, 113.4 g (1.2 moles) of chloroacetic acid and 11.8 g of concentrated sulfuric acid are heated to reflux in 1000 ml of toluene using a water separator. The formation of water ceases after about 2 hours and 18 ml have separated. The reaction solution is washed with saturated sodium bicarbonate solution and water. The organic phase is dried over magnesium sulfate and concentrated in a rotary evaporator at 40° C. The residue is dried for 2 hours at 60° C./0.1 mm, affording 206 g of a colourless liquid.
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